Vitamin A blood test

Definition

Alternative Names

How the Test is Performed

How to Prepare for the Test

Follow your health care provider's instructions about not eating or drinking anything for up to 24 hours before the test.

How the Test will Feel

When the needle is inserted to draw blood, some people feel moderate pain. Others feel only a prick or stinging. Afterwards, there may be some throbbing or slight bruising. This soon goes away.

Why the Test is Performed

This test is done to check if you have too much or too little vitamin A in your blood. (These conditions are uncommon in the United States.)

Normal Results

Normal values range from 15 to 60 micrograms per deciliter (mcg/dL) or 0.52 to 2.09 micromoles per liter (micromol/L).

Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.

What Abnormal Results Mean

A lower than normal value means you do not have enough vitamin A in your blood. This may cause:

Bone or teeth problems in young children

Dry or inflamed eyes

Night blindness

Recurring infections

Skin rashes

Reduced growth

Dry skin

A higher than normal value means you have excess vitamin A in your blood (toxic levels). This may cause:

Hair loss

Loss of appetite

Bone and muscle pain

Increased pressure in the brain (pseudotumor cerebri)

Anemia

Double vision

Liver and spleen enlargement

Nausea

Diarrhrea

Lack of muscle coordination (ataxia)

Vitamin A deficiency may occur if your body has trouble absorbing fats through the digestive tract. This may occur if you have:

Chronic lung disease called cystic fibrosis

Pancreas problems, such as swelling and inflammation (pancreatitis) or the organ not producing enough enzymes (pancreatic insufficiency)

Small intestine disorder called celiac disease

Risks

There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than from others.

Other risks associated with having blood drawn are slight but may include:

Information developed by A.D.A.M., Inc. regarding tests and test results may not directly correspond with information provided by UCSF Health. Please discuss with your doctor any questions or concerns you may have.

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